In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

Breaches cost Cootes further fine in Vic

The trucking company involved in a tanker explosion that killed two people in Sydney has copped a further fine for safety breaches in Victoria.

The $50,250 penalty comes on top of a $440,900 fine Cootes Transport Pty Ltd was ordered to pay in NSW last month for 255 charges arising from safety breaches.

With legal costs, the company will pay more than half a million dollars in NSW.

Cootes, which transports petrol and other fuels for global oil and gas companies, came under intense scrutiny after a tanker rolled on its side and burst into flames, killing two and injuring five, in Mona Vale last October.

The company's 201 Victorian vehicles were grounded for a safety inspection that uncovered 139 major and 38 minor defects.

Sixty-seven of the major defect notices rendered the vehicles unsafe for use on highways, according to VicRoads automotive technicians.

The company said in a statement it had improved the standard of its fleet.

A safety inspection of the fleet last week found no defects.

"All servicing and testing procedures have been upgraded and we continue to work closely with the VicRoads and independent certifiers to continue to ensure the integrity of our fleet," Cootes Transport said.

VicRoads chief operating officer Peter Todd said the road authority had worked closely with Cootes and the company had made significant improvements, but VicRoads would continue to monitor them.

He said most operators were doing the right thing.

"However we do continue to see a minority that give us no choice but to be really critical of them," Mr Todd said.

The penalty imposed against Cootes would send a powerful message that safety cannot be sacrificed, he said.